Earlier this year, WWF estimated an increase in the number of tigers worldwide, up to 3,890 in 2016 from an estimated 3,200 in 2010. But success to date is tenous: According to a new report from WWF, tigers now face a threat far greater than many we’ve tackled before: linear infrastructure.

In November 2010, 13 tiger range countries came together and made an unprecedented pledge: to double the number of wild tigers by 2022. Mobilized by a century of dramatic decline, leaders convened in St. Petersburg, Russia to sign a declaration boosting tiger conservation efforts. This initial effort has led to significant momentum and progress, and for the first time in 100 years, tiger numbers are on the rise. Here are some highlights from the last six years.

Tiger populations fighting for a comeback in the wild will receive a much needed lifeline from the United States government. Improved and tightened regulations around captive tigers will make it more difficult for captive-bred tigers to filter into and stimulate the illegal wildlife trade that threatens wild tigers in Asia.

Bringing tigers back from the brink takes commitment on a global scale. Faced with this challenge, tiger range countries took a stand and set an ambitious species conservation goal: double the number of wild tigers by 2022—the next Year of the Tiger. The goal is called Tx2.

Tigers are the most iconic of the big cats. With their gorgeous black-and-orange coats and long, white whiskers, they invoke in many a feeling of wonder and admiration. But though they are adored, they’re also vulnerable to extinction.

Bhutan is home to an amazing 103 wild tigers—an increase from a previous estimate of 75 that was not based on actual field surveys—according to the country’s first-ever tiger survey released on Global Tiger Day Conducted entirely by Bhutanese scientists, the survey spanned habitats ranging from snowy, cold mountains in the north—where both tigers and snow leopards roam wild—down to dense, subtropical forests in the south.

Rare new footage shows a tigress and her cubs inside the forests of Thailand’s Mae Wong National Park. But along with this thrilling video comes news of a possible irreversible threat—a $400 million dam proposed on the nearby Mae Wong River.